EP 0147005 A3 19861001 - OXIDATION OF PITCH FIBERS
Title (en)
OXIDATION OF PITCH FIBERS
Publication
Application
Priority
US 52052683 A 19830805
Abstract (en)
[origin: EP0147005A2] The oxidation of carbon fibers from pitch is carried out directly by winding the spun fiber (1) on to a spinning spool or bobbin (2), said spool (2) comprising an open ended, porous, non-expanding, non-collapsible spool. The spun carbon fibers (1) are wound to leave open areas between fiber bundles. A mixture of an inert gas, for example nitrogen, containing a minor amount of oxygen is used as the oxidising gas. Oxidation is carried out in a closed zone at a temperature that is initially below the glass transition temperature of the carbon fibers and is slowly increased over the oxidation time to a maximum of about 340°C. The gaseous oxidation atmosphere is preferably continuously recycled and passed through the spool (2) to ensure that the fibers (1) are essentially completely oxidised.
IPC 1-7
IPC 8 full level
D01F 9/14 (2006.01); D01F 9/145 (2006.01); D01F 9/32 (2006.01)
CPC (source: EP US)
D01F 9/145 (2013.01 - EP US); D01F 9/322 (2013.01 - EP US)
Citation (search report)
- [X] GB 1397794 A 19750618 - COAL INDUSTRY PATENTS LTD
- [AD] US 4351816 A 19820928 - SCHULZ DAVID A
- [A] US 3595946 A 19710727 - JOO LOUIS A, et al
- [AD] US 4275051 A 19810623 - BARR JOHN B
- [X] DERWENT JAPANESE PATENTS REPORTS, vol. T, no. 33-I, page 3, London, GB; & JP - A - 72 29 943 (TORAYS INDS. ING.) 05-08-1972
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
EP 0147005 A2 19850703; EP 0147005 A3 19861001; AU 3160384 A 19850207; AU 565364 B2 19870910; CA 1225805 A 19870825; JP S6052621 A 19850325; US 4576810 A 19860318
DOCDB simple family (application)
EP 84305280 A 19840803; AU 3160384 A 19840803; CA 460184 A 19840801; JP 16019384 A 19840730; US 52052683 A 19830805